As our cameras get more and more pixel crazy, editing our images takes more resources and taxes our computers. Do you need to go out and buy a new computer just to run Lightroom 4.3? If you’re shooting a 36 megapixel D800, maybe. But otherwise, there are a few things you can do to boost the performance of Lightroom.
First of all, before you do ANY editing, determine if you need to use the spot removal tool to remove sensor dust spots, blemishes or anything else. If you do, use this tool first, before doing anything else. If you use the spot removal tool on a fresh, untouched image, it will work way faster. Otherwise, it has to burrow down through all the adjustment commands in order to know what needs to be removed or cloned. Remember, in Lightroom, you’re actually creating a set of commands stored in a database to create a preview of the edited image. You’re not actually affecting pixels like you are in Photoshop. So, using the resource heavy spot removal tool before making any other adjustments will definitely speed up the processing.